The purpose of the method and device is to increase the scope of patent protection. According to relevant public information inquiries: the protection scope of a method patent can be extended to products directly obtained by this method. In infringement lawsuits and applications involving new products, method patents, the burden of proof is reversed. The other party needs to prove that it is not using the same method as the patented method. , the combination of method and product patents has a greater scope of protection.